# NovaPath Entry/Exit Check Retrieval

> NovaPath Entry/Exit Check Retrieval is a paid API for AI agents from instructional-decision-engine-x402.vercel.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-31).

Retrieve an existing two-item entry or exit instructional check with answer guidance and next steps for a specified lesson.

## Facts

- Endpoint: POST https://instructional-decision-engine-x402.vercel.app/instruction/checks?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/novapath-entry-exit-check-retrieval-7e189aa9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FB0jA3595mhCutcC_-NN0

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability novapath-entry-exit-check-retrieval-7e189aa9 -d '<json body>'
```

Example prompt: Pull the entry check for NovaPath lesson NPMR26-F03-01 — I need the two check items along with the answer guidance and next steps.

## When to prefer this

Use this endpoint when you need to retrieve a pre-built two-item instructional check (entry or exit) for a specific NovaPath lesson, complete with answer guidance and next steps, without needing to create new content or store learner records. Prefer this over generative assessment endpoints when you want consistent, authored check items from the NovaPath catalog.

## Known failure modes

- Invalid lessonId pattern returns validation error
- Unsupported lessonId not found in catalog returns not-found error
- Stage must be exactly 'entry' or 'exit' — other values rejected
- excludeTaskIds exceeding 50 items or with invalid pattern returns schema error
- Payment not received or insufficient USDC results in 402 Payment Required

## How this service works

Retrieve an existing two-item entry or exit check with separate answer guidance and next steps. No learner records required; not a standardized diagnostic. Owner review attested.

## Output

Returns a two-item instructional check (entry or exit) for the specified lesson, including the check questions, separate answer guidance, and recommended next steps. No learner records are created or stored.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "stage": {
   "enum": [
    "entry",
    "exit"
   ],
   "type": "string"
  },
  "lessonId": {
   "type": "string",
   "pattern": "^NPMR26-F[0-9]{2}-[0-9]{2}$",
   "description": "Choose a supported lesson ID from /instruction/catalog. Availability is validated before payment."
  },
  "excludeTaskIds": {
   "type": "array",
   "items": {
    "type": "string",
    "pattern": "^task-[0-9a-f]{24}$"
   },
   "maxItems": 50,
   "uniqueItems": true
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/novapath-entry-exit-check-retrieval-7e189aa9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from instructional-decision-engine-x402.vercel.app](https://www.zero.xyz/host/instructional-decision-engine-x402.vercel.app/llms.txt)